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Blocking Lymph Flow by Suturing Afferent Lymphatic Vessels in Mice
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Lymphoepithelial interactions: a new paradigm.

Stephanie Dahan1, Franziska Roth-Walter, Andrea P Martin

  • 1Immunology Institute, Mount Sinai School of Medicine, New York, New York 10029, USA.

Annals of the New York Academy of Sciences
|June 23, 2009
PubMed
Summary
This summary is machine-generated.

Lamina propria lymphocytes (LPL) interact with intestinal epithelial cells (IECs), influencing their differentiation. Altered crosstalk in Crohn's disease (CD) accelerates IEC differentiation, impacting the epithelial barrier.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • Intestinal lymphoepithelial interactions are crucial in gut homeostasis.
  • Dysregulated epithelial cell differentiation is observed in inflammatory bowel diseases like Crohn's disease (CD) and ulcerative colitis (UC).
  • The role of lamina propria lymphocytes (LPL) in modulating intestinal epithelial cell (IEC) differentiation requires further elucidation.

Purpose of the Study:

  • To investigate the role of lamina propria lymphocytes (LPL) in promoting intestinal epithelial cell (IEC) differentiation.
  • To understand the specific mechanisms of LPL-IEC crosstalk in Crohn's disease (CD) and its impact on epithelial barrier function.
  • To compare LPL-IEC interactions in CD with those in ulcerative colitis (UC) and healthy controls.

Main Methods:

  • Comparative analysis of LPL-IEC interactions in mucosal biopsies from CD, UC patients, and healthy controls.
  • In vitro co-culture systems to study the effects of LPL on IEC differentiation.
  • In vivo studies using Rag1-deficient mice models with adoptive T cell transfer.
  • Molecular analysis involving transcription factors (e.g., CDX2) and signaling pathways (PI3K, MAPK).

Main Results:

  • LPL significantly influence IEC differentiation, with altered crosstalk observed in CD.
  • CD LPL promote accelerated IEC differentiation, involving CDX2 activation via PI3K and MAPK pathways.
  • Rag1-deficient mice lacking lymphocytes showed defective colonic IEC differentiation, which was restored by T cell co-transfer.
  • Naïve T cell transfer alone mimicked the accelerated IEC differentiation seen in CD colonic mucosa.

Conclusions:

  • LPL-IEC crosstalk is fundamentally altered in Crohn's disease, leading to accelerated IEC differentiation and an absorptive phenotype.
  • This dysregulated crosstalk contributes to epithelial barrier dysfunction in CD.
  • Targeting LPL-IEC interactions may offer novel therapeutic strategies for Crohn's disease.